interface driver to cubase or Os ??

hi all, happy 2011…

my setup is window 7 64bit with cubase studio 5 32 bit,
and im upgrading my audio n midi interface…can anyone help me out here, should i install the new interface driver 32 or 64 bit? it should follow the Os right?? …which is 64bit??

Hardware device drivers must always be 64 bit for a 64bit OS whatever the software application (32 or 64 bit) you are running on it.

Cheers,
Bernard

thanx man